If an application has an icon, Textpad could use that icon for that tool.
If an appication doesn't have an icon, however, (a batch file, for example), then it's difficult to see where that icon could come from. Not all text editor users are au fait with creating ".ico" files.
This would really make a difference. Then one can have nice toolbars turned on. A list of only hammers is really silly and un-usable.
(Though I mostly use the keyboard to get to the tools anyway. But the eye cannot be ignored.)